水注是一个什么用品:()
A、文房
B、厨房
C、教学
D、体育
参考答案:A
已知M=3a2-2ab-4b2,N=4a2+5ab-b2,求3M-2N的值.
— I want to visit Beijing, the capital of China, but I don't know much about the city.
— Don't worry. Let's try to find some information about it _____ the Internet on the computer. [ ]
A: to search
B: at searching
C: by searching
D: for searching